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Home >> Toyota >> 2019 >> Sienna SE, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes (2 Of 2) & Circuit Tests (1 Of 3) >> Can Communication System >> Diagnostic Codes >> DTC U1002 (CAN No. 2 BUS): Lost Communication with Gateway Module (Network Gateway ECU) [08/2016 - 11/2017] >> Description

DTC U1002 (CAN No. 2 BUS): Lost Communication with Gateway Module (Network Gateway ECU) [08/2016 - 11/2017]: Description

If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (One side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).

DTC Code Symptoms Trouble Area
U1002 (CAN No. 2 BUS) Lost communication with the gateway module (network gateway ECU).
  • V2 bus circuit
  • Power management control ECU*1 or network gateway ECU*2 main wire or connector
  • Seat belt control ECU branch wire or connector*3
  • AFS ECU (headlight swivel ECU assembly) branch wire or connector*4
  • Parking assist ECU branch wire or connector*5
  • Driving support ECU assembly branch wire or connector*6
  • Clearance warning ECU assembly branch wire or connector*7
  • Blind spot monitor sensor RH branch wire or connector*8
  • Power management control ECU*1
  • Network gateway ECU*2
  • Seat belt control ECU*3
  • AFS ECU (headlight swivel ECU assembly)*4
  • Parking assist ECU*5
  • Driving support ECU assembly*6
  • Clearance warning ECU assembly*7
  • Blind spot monitor sensor RH*8
  • 4WD ECU assembly*9*1
  • No. 4 junction connector
  • No. 5 junction connector
  • No. 2 junction terminal
  • No. 3 junction connector*1
  1. *1: w/ Smart Key System
  2. *2: w/o Smart Key System
  3. *3: w/ Pre-Collision System
  4. *4: w/ HID Headlight System
  5. *5: w/ Parking Assist Monitor System
  6. *6: w/ Dynamic Radar Cruise Control System
  7. *7: w/ Intuitive Parking Assist System
  8. *8: w/ Blind Spot Monitor System
  9. *9: for AWD